secretary of state john kerry will travel to the ukraine on tuesday and says the u.s. and its allies are putting russia on notice. >> all of them are prepared to go to the hilt in order to isolate russia with respect to this invasion. they're prepared to put sanctions in place. they're prepared to isolate russia economically. >> reporter: kerry made it clear the u.s. has no plans to use military force against russia but did suggest the u.s. would boycott the upcoming g-8 summit if moscow continues down its current path. >> a footnote. tonight the u.s. and six other nations say they're suspending participation in the planning for this summer's international summit in sochi, russia. >>> hundreds of people protesting the proposed keystone xl pipeline are arrested in front of the white house today, many of them college students. they chained themselves to the white house fence chanting climate justice now. the group urged president obama to reject the pipeline. that pipeline would carry crude oil from canada to the gulf coast. opponents say the pipeline will make global wa